Question

a convex lens is said to have a real focus and a concave lens a Virtual Focus. why?

Answer 1

Virtual means when the image if formed behind the mirror

Answer 2

Dear mate..

Because real images are images that can be caught on screen . Convex Lens always produce images that can be caught in a screen except one case , when the object is kept at focus F1 and optical centre O .

Virtual images are images that cannot be caught on a screen . These images are produced by concave lens in all cases. ie ,they are found behind the lens.

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